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3 years ago

• How does AC work?

1 answer:

4 0

AC reverses the current in periods, and the current flows in 2 directions.
DC only flows in one direction and is constant.

AC is typically used to transfer power over long distances from a generator to your home, stepping it up after it's generated to send it over the distance, then stepping it back down so that it is usable in your home.

DC is used typically inside of devices, as it sends a certain amount of electricity through the wires.

Nicolas Tesla, was ripped off by Edison to replace his DC stations with AC instead. ^^

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3 years ago

Two swimmers A and B, of weight 190 lb and 125 lb, respectively, are at diagonally opposite corners of a floating raft when they

Harrizon [31]

Answer:

a) 0.618 ft/s

b) 3.04 ft/s

Explanation:

Givens:

Weight of swimmer A $W_{A}$ = 190 Ib.

Weight of swimmer B $W_{B}$ = 125 Ib.

Weight of the raft $W_{R}$ = 300 Ib.

Swimmer A walks toward swimmer B relative to the raft with a speed

$V_{A/R}$ = 2 ft/s

a) Conservation of linear momentum

$m_{A} v_{A} +m_{B} v_{B} +m_{R} v_{R} =0..........(1)\\v_{A/R}=v_{A} -v_{R}\\\v_{A}=v_{A/R}+v_{R}.................(2)$

Since swimmer B does not move

$v_{B} =v_{R}...............(3)$

Substitute from (2) and (3) into (1)

$m_{A} (v_{A/R} +v_{R} )+m_{B} v_{R} +m_{R} v_{R}=0\\(m_{A}+m_{B}+m_{R})v_{R} =-m_{A}v_{A/R}\\v_{R}=\frac{-m_{A}v_{A/R}}{m_{A}+m_{B}+m_{R}} \\v_{R}=0.618ft/s$

b) if the raft not to move $v_{R}=0$

from (2)

$v_{A} =v_{A/R}$

substitute in (1)

$m_{A} v_{A/R} +m_{B} v_{B}+m_{R} (0)=0\\v_{B}=\frac{W_{A}v_{A/R}}{W_{B}} \\v_{B}=3.04ft/s$

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3 years ago